What it works out
Count blocks for a wall. Enter the wall as a length and a height, or as an area, or enter a length alone for a single course. The block face area and the block length start from the block size stored in Settings; change them here for this wall without changing Settings. You get the exact count and an order quantity: waste is added first, then the total is rounded up once. Openings are not subtracted, so take them off the area yourself.
The formula
- Blocks
- area ÷ block area, or length ÷ block length, or length × height ÷ block area
In words: Blocks = area divided by block area, or length divided by block length, or length times height divided by block area
Worked example
A wall 24 ft long and 4 ft high, with blocks 16 in by 8 in
- Length 24 ft
- Height 4 ft
- Block face 16 in × 8 in (128 in²)
- Wall area = 24 × 4 = 96 ft² = 13,824 in²
- Block face area = 16 × 8 = 128 in²
- Blocks = 13,824 ÷ 128 = 108
Waste is added first and the total is rounded up once. Block size comes from your settings and can be changed for one wall.
Good to know
- Openings are not subtracted: take them off the area yourself.
- Mortar joints are not modelled: use the block size you actually lay.
- A calculator, not a building-code check: confirm local rules with your building authority.
Questions
Do I enter the nominal block size?
Use the face size you lay, including the joint if your block listing includes it.
Can I count one course?
Yes. Enter a length alone.